Laminated spring.



A. E. McWIANUS. LAMINATED SPRING. APPLICATION FILED OCT. 5.1916.

Patented Apr. 3,1917.

INVENTOR.

1 BY fi AZTTIORYVEY WITNESSES a citizen of the ALBERT E. MGIVIANUS, or DULUTH,'MI1\TNESOTA.

LAMINATED SPRING.

mmmm Specification of Letters Patent.

Application filed October 5, 1916.

To all whom it may concern:

Be it known that I, ALBERT E. McMANUs, United States, residing at Duluth, in the county of St. Louis and State of Minnesota, have invented new and useful Improvements in Laminated Springs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to laminated or plural leaf springs and has for its object the provision of a plural leaf spring which may be easily and conveniently oiled and in which the oil receiving passages may be readily cleaned without taking the spring apart. It consists of the constructions, combinations and arrangements of parts hereinafter described and claimed.

In the drawings, Figure'l is a side elevation of one form of elliptical spring in which my invention may be embodied. Fig. 2 is a central vertical cross section of said spring showing one form of my invention embodied therein.- Fig. 3, is a central Vertical cross section of elliptical spring, showing a modified form of my invention embodied therein.

In the drawings each of the leaves 1 and 2 composing the upper and lower bows re.

spectively of said spring (Fig. 2) has formed upon its upper face at one or both sides, a longitudinally directed shallow head or rib 1 2, except the top leaf of each bow, from which such bead may, if desired, be omitted. In the-preferred form of my invention (Fig. 2) each successive leaf in the bottom bow is slightly narrower than the leaf next below it, whereby oil receiving channels 2 are formed between the beads on each beaded leaf and the sides of the next superposed leaf. In said preferred form, each successive leaf in the upper slightly narrower than the leaf next below it in the same bow, whereby oil receiving channels 1", are formed between the beads on each beaded leaf and the sides of the posed leaf. The floors of said channels are preferably flush with the contacting faces of the respective leaves. In the modified form of my invention (Fig. 3) the leaves are of substantially uniform width, and are provided with beads substantially similar to the lower bow of an superposed leaves, each bow is also next super- Patenteol Apr. 3, 1917. Serial No. 123,867.

those provided in the preferred form-of spring; but in said modified form the lower edges of each leaf in the lower bow, except the bottom leaf, are undercut or beveled inwardly and downwardly'as at 2 so as to provide oil receiving spaces or channelsbetween the beads of each beaded leaf and theover hanging sides of the next superposed leaf.

In operation, oil is injected into the several channels or oil receiving spaces, and thence runs between the opposing facesof the respective leaves, the spread of the oil being facilitated by the action of the leaves .upon each other when the spring is being expanded or contracted. If sald oil receiving channels or spaces become choked with dust, they may easily be scraped clean with a screw driver or other convenient implement.

While I have shown certain forms of plural leaf springs embodying my invention I do not desire to limit myself to such forms only. It is obvious that niy invention may be modified in details'or embodied in other forms of plural leaf springs, within the scope and spirit of certain of my claims.

hat I claim is,

1. A spring comprising a plurality of superposed leaves, some of said leaves having a longitudinally directed bead formed upon their upper surfaces at one side, the upper edge of each such bead being spaced from the side of the respectively next superposed leaf.

2. A spring comprising a plurality of superposed leaves, some of said leaves being undercut at one side said undercut portion being spaced from the respectively next underlying one of said leaves.

spring comprising a plurality of two adjoining ones of said leaves being adapted in cooperation with each other to form an open groove or channelat one side of said spring, the bottom of such channel being flush with upper face of the central portion of the lower one of the two leaves by which such channel is formed.

In testimony whereof, I hereunto afiix my signature, in presence of two witnesses.

ALBERT E. MOMANUS.

Witnesses:

TEGKLA H. OLSON, JENNIE HANSON.

sharp piece of wood or 

